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jffry
<blockquote><em>13. Avoid magic numbers.</em></blockquote>
I read most of wikipedia's article on [http://en.wikipedia.org/wiki/Magic_number_(programming)|magic numbers] and could not see the problem.
Then I found this [http://stackoverflow.com/questions/47882/what-is-a-magic-number-and-why-is-it-bad|Stack Overflow question] that explains it.
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